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PCF8820U

67 × 101 Grey-scale/ECB colour dot matrix LCD driver

Philips Electronics 

Philips Semiconductors

67 × 101 Grey-scale/ECB colour dot matrix

LCD driver

Product specification

PCF8820

1 FEATURES

• Single-chip LCD controller and driver for grey-scale/

Electrically Controlled Birefringence (ECB) colour

• 4 grey levels/colours (2-bit) definable from 64 levels

• 67 row and 101 column outputs

• Display data RAM 67 × 101 × 2-bit with linear RAM

addressing

• Partial screen mode with reduced current consumption

(8 rows at top or bottom of display)

• On-chip:

– Generation of LCD supply voltage (VLCDOUT);

external supply also possible

– Configurable voltage multiplier factor of

8, 7, 6, 5, 4, 3 or 2; direct drive also possible

– Selectable linear temperature compensation

of VLCDOUT

– Generation of intermediate LCD bias voltages

– Oscillator requires no external components; external

clock also possible.

• Temperature read-out

• Fast mode I2C-bus interface (400 kbits/s)

• Frame frequency calibration via software

• Software selectable bias configuration

• Compatible with 4-bit, 8-bit or 16-bit microcontrollers

• Multiplex rates of 1 : 67 or 1 : 8

• Logic supply voltage range from 2.5 to 5.5 V

(VDD1 to VSS1)

• High voltage generator supply voltage range from

2.7 to 5.5 V (VDD2 to VSS1 and VDD3 to VSS2)

• Bias voltage generator supply voltage range

(VLCDIN to VSS1):

– From 7 to 14.5 V at a multiplex rate of 1 : 67

– From 4.5 to 14.5 V in partial screen mode at a

multiplex rate of 1 : 8.

• Low power consumption, suitable for battery operated

systems

• Slim chip layout, suitable for chip-on-glass applications

• Software selectable top and bottom row swap for

adapting driver to different glass-layouts

• CMOS compatible inputs

• Manufactured in silicon gate CMOS process.

2 APPLICATIONS

• Mobile telecommunication systems

• Battery powered equipment

• Point of sale terminals

• Instrumentation

• Automotive information systems.

3 GENERAL DESCRIPTION

The PCF8820 is a low power CMOS LCD row/column

driver, designed to drive grey-scale/ ECB colour dot matrix

graphic displays at a multiplex rate of 1 : 67. In the partial

screen mode, only 8 rows are driven at a multiplex rate of

1 : 8.

This chip provides all the necessary display functions,

including on-chip generation of the LCD supply voltage

and LCD bias voltages. Consequently, fewer external

components are required and the power consumption is

low.

The PCF8820 interfaces with most microcontrollers and

communicates via a two-line bidirectional bus (I2C-bus).

All inputs are CMOS compatible.

Remark: the waveform generation for ECB colour is

identical to that used for grey-scale.

4 ORDERING INFORMATION

TYPE NUMBER

PCF8820U

NAME

−

PACKAGE

DESCRIPTION

chip with bumps in tray

VERSION

−

2000 Dec 07

3

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